JP5975965B2 - Elevator shock absorber, elevator shock absorber installation method, elevator shock absorber maintenance method, and elevator - Google Patents

Description

  The present invention relates to an elevator shock absorber for mitigating an impact on a lifting body (such as a car or a counterweight), an elevator shock absorber installation method, an elevator shock absorber maintenance method, and an elevator.

  Conventionally, in order to shorten the height dimension, a plurality of hollow plungers, which are successively formed to have a small diameter, are concentrically polymerized, and an expansion / contraction plunger configured to expand and contract in the vertical direction via hydraulic oil is installed in the base cylinder. There has been proposed an oil-filled shock absorber for an elevator that is elastically supported. The extendable plunger is expanded and contracted by displacing each plunger while moving the hydraulic oil between the inside and outside of the hollow plunger. In such a conventional oil-filled shock absorber for elevators, the lowermost plunger returns to the upper side by the elastic force of the spring with respect to the base cylinder, so that all the plungers return by the pressure of the hydraulic oil (Patent Document 1). reference).

JP-A-4-217777

  However, in the conventional oil-filled shock absorber for elevators as described above, the mass of the upper plunger is supported by the pressure of the hydraulic oil in the lower plunger, so it operates in the plunger during installation or maintenance of the shock absorber. When injecting oil, it is necessary to inject the operating oil into the plunger while applying pressure to the operating oil by a special device such as a hydraulic pump. Accordingly, it is necessary to transport a hydraulic pump or the like to the site during installation or maintenance of the shock absorber. In addition, the work space in the hoistway may be narrow, and it may be difficult to carry a hydraulic pump or the like into the hoistway. Furthermore, in recent years, elevators have been installed in various places around the world, and it is difficult to work by transporting hydraulic pumps or the like to all sites. For this reason, in conventional oil-filled shock absorbers for elevators, the efficiency of installation work and maintenance work is extremely poor, and costs are increased.

  Also, when working oil is injected into the plunger when the telescopic plunger is extended and the height of the entire shock absorber is increased, it is very difficult to inject hydraulic oil into the plunger near the top. You have to do it high. Therefore, it takes time and labor to assemble the work scaffold, and in this respect as well, work efficiency is reduced and costs are increased.

  The present invention has been made in order to solve the above-described problems, and can facilitate the operation of injecting hydraulic fluid into the elevator buffer and can reduce the cost. An object is to obtain an elevator shock absorber installation method, an elevator shock absorber maintenance method, and an elevator.

  An elevator shock absorber according to the present invention includes a base cylinder having a hollow portion standing vertically to a pit portion of a hoistway, a plurality of plungers sequentially connected so as to slide upward from the base cylinder, and a lowermost plunger. And each plunger has a plate-like piston and a plunger main body extending upward from the piston, and the upper and lower plungers are connected to each other. The plunger body of the lower plunger is a hollow portion, and the piston of each plunger is arranged so as to separate the space in the hollow portion adjacent to the lower part up and down and slide into the hollow portion. Passes through the upper part of the hollow part adjacent to the lower part, and between the hollow part of the plunger and the hollow part adjacent to the lower part. Is provided with an outer chamber whose volume increases according to the downward displacement of the plunger, and an inner chamber whose volume decreases according to the downward displacement of the plunger adjacent above is provided in the hollow portion of the plunger. As the hydraulic fluid moves between the outer chamber and the inner chamber through the communication hole provided in the hollow portion of the plunger, each plunger is slid with respect to the hollow portion adjacent to the lower portion, so that the whole is expanded and contracted. The upper portion of the hollow portion is provided with an injection hole for injecting the working fluid into the outer chamber, and the piston has a piston discharge hole for discharging the working fluid from the outer chamber to the space adjacent to the lower portion. The piston discharge hole is provided to be opened and closed. Among the spaces in the hollow portion of the base cylinder, the space that communicates with the outer chamber by opening the piston discharge hole is for discharging the working fluid to the outside. Outside In communication with the outside through Deana.

  According to the elevator shock absorber according to the present invention, since the injection hole for injecting the working fluid into the outer chamber is provided in the upper part of the hollow portion, when the operating oil is being injected into the outer chamber, the injection hole Therefore, the hydraulic oil can be prevented from flowing backward. Accordingly, sufficient hydraulic oil can be injected into the outer chamber without using a hydraulic pump or the like for forcibly applying pressure to the hydraulic oil, thereby facilitating the operation of injecting hydraulic oil into the elevator buffer. be able to. In addition to eliminating the need for a hydraulic pump, etc., it is possible to inject all the hydraulic fluid while maintaining the contracted state of the elevator buffer, so the hydraulic fluid is injected into the elevator buffer. Therefore, the height dimension of the scaffold used for doing so can be reduced, and the labor for assembling the scaffold can be reduced. Thereby, cost reduction can be aimed at.

It is a typical side view which shows the elevator by Embodiment 1 of this invention. It is sectional drawing which shows the cage | basket buffer of FIG. It is sectional drawing which shows a state when the cage buffer of FIG. 1 is installed in the pit part of a hoistway. It is sectional drawing which shows the state by which the cage | basket shock absorber of FIG. 2 was compressed by the cage | basket | car. It is sectional drawing which shows the state which raised the cage | basket | car in the state which removed the lid | cover of the injection hole of FIG. It is sectional drawing which shows the cage | basket buffer which the hydraulic fluid in each outer side oil chamber of FIG. It is sectional drawing which shows the modification of the elevator car buffer by Embodiment 1 of this invention. It is sectional drawing which shows another modification of the elevator car buffer by Embodiment 1 of this invention. It is sectional drawing which shows the elevator car buffer of Embodiment 2 of this invention. It is sectional drawing which shows the elevator car buffer of Embodiment 3 of this invention. It is a top view which shows the example which provided the projection part in each of the 1st and 2nd plunger of the cage buffer of FIG. It is sectional drawing which shows the example which provided the handle for operation in each of the 1st and 2nd plunger of the cage buffer of FIG. It is a top view which shows the cage buffer of FIG. It is sectional drawing which shows the elevator car shock absorber by Embodiment 4 of this invention. It is sectional drawing which shows the state by which the piston discharge hole of FIG. 14 is open | released. It is a top view which shows the piston of the 2nd plunger of FIG. It is a top view which shows the piston of the 2nd plunger of FIG. It is sectional drawing which shows the elevator car buffer of Embodiment 5 of this invention. It is sectional drawing which shows the contraction state of the cage buffer of FIG. It is sectional drawing which shows the elevator car buffer by Embodiment 6 of this invention. It is sectional drawing which shows the elevator car buffer of Embodiment 7 of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic side view showing an elevator according to Embodiment 1 of the present invention. A machine room 2 is provided in the upper part of the hoistway 1. Further, a car (elevating body) 3 and a counterweight (elevating body) 4 are provided in the hoistway 1 so as to be able to move up and down. The car 3 and the counterweight 4 are suspended in the hoistway 1 by a suspension body 5. For example, a rope or a belt is used as the suspension body 5.

  The car 3 has a car frame and a car room supported by the car frame. The car 3 is configured by assembling a car frame and a car room in the hoistway 1. The counterweight 4 has a weight frame and a plurality of weight blocks supported by the weight frame. The counterweight 4 is configured by assembling a weight frame and each weight block in the hoistway 1.

  In the machine room 2, a hoisting machine (driving device) 6 that generates a driving force for raising and lowering the car 3 and the counterweight 4 and a deflecting wheel 7 are provided. The hoisting machine 6 includes a hoisting machine main body 8 including a motor, and a driving sheave 9 provided in the hoisting machine main body 8 and rotated by the driving force of the hoisting machine main body 8. The suspension body 5 is continuously wound around the drive sheave 9 and the deflector wheel 7. The car 3 and the counterweight 4 are moved up and down in the hoistway 1 by rotating the driving sheave 9.

  In the pit portion (lower end portion) of the hoistway 1, a car shock absorber (elevator shock absorber) 10 located below the car 3 and a counterweight shock absorber (elevator buffer) located below the counterweight 4. 11). When the car 3 passes through the lowest floor and is further lowered due to some abnormality, the car 3 collides with the car buffer 10. When the car shock absorber 10 receives a collision of the car 3, the car shock absorber 10 absorbs the shock from the car 3 and relaxes the shock to the car 3. When the counterweight 4 passes through the lowest floor and is further lowered due to some abnormality, the counterweight 4 collides with the counterweight buffer 11. When the counterweight buffer 11 receives a collision of the counterweight 4, the counterweight buffer 11 absorbs an impact from the counterweight 4 and relaxes the impact on the counterweight 4.

  FIG. 2 is a cross-sectional view showing the car shock absorber 10 of FIG. The car shock absorber 10 includes a base cylinder 20 fixed to a pit portion of the hoistway 1 and first to third plungers (a plurality of plungers) sequentially connected to the base cylinder 20 so as to be slidable (displaceable) upward. A return spring (biasing body) 60 that biases the lowermost first plunger 30 of the first, second and third plungers 30, 40, 50 upward with respect to the base cylinder 20. And have.

  The base cylinder 20 includes a bottom plate (base portion) 21 disposed horizontally and a base cylinder body 22 provided on the bottom plate 21. The base cylinder main body 22 is a hollow portion having an internal space into which the first plunger 30 (a first-stage plunger) is inserted.

  The first plunger 30 has a plate-like piston 31 and a plunger main body 32 extending upward from the piston 31. The piston 31 of the first plunger 30 separates the space in the base cylinder body (hollow part) 22 one step below (that is, the space in the hollow part adjacent to the lower part) vertically, and the base cylinder body (one step below) The hollow portion 22 is slidably disposed. The plunger main body 32 of the first plunger 30 penetrates the upper part of the base cylinder main body 22 one step below so as to be slidable. The plunger main body 32 of the first plunger 30 is a hollow portion having an internal space into which the second plunger 40 on the upper stage is inserted.

  The second plunger 40 has a plate-like piston 41 and a plunger main body 42 extending upward from the piston 41. The piston 41 of the second plunger 40 separates the space in the plunger main body (hollow part) 32 one step below (that is, the space in the hollow part adjacent to the lower part) up and down, and the plunger main body (hollow part) one step below. ) It is slidably arranged in 32. The plunger main body 42 of the second plunger 40 penetrates the upper part of the plunger main body 32 one step below so as to be slidable. The plunger main body 42 of the second plunger 40 is a hollow part having an internal space into which the third plunger 50 on the upper stage is inserted.

  The uppermost third plunger 50 has a plate-like piston 51 and a plunger main body 52 extending upward from the piston 51. The piston 51 of the third plunger 50 separates the space in the plunger main body (hollow part) 42 one step below (that is, the space in the hollow part adjacent to the lower part) up and down, and the plunger main body (hollow part) one step below. ) Is slidably disposed within 42. The plunger main body 52 of the third plunger 50 passes through the upper portion of the plunger main body 42 one step below through a gap. Further, the plunger main body 52 of the third plunger 50 is a solid part having no internal space. A rubber shock absorbing member 53 is provided at the upper end of the plunger main body 52 of the third plunger 50 to relieve instantaneous shock.

  That is, of the first to third plungers 30, 40, 50, the plunger main body 32 of the plunger (that is, the first and second plungers 30, 40) excluding the third plunger 50 located at the uppermost stage. 42 is a hollow part. In other words, of the upper and lower plungers connected to each other, the plunger body of the lower plunger is a hollow portion.

  The base cylinder main body 22 is fixed to a cylindrical portion 22a that is vertically fixed to the upper surface of the bottom plate 21, and an upper lid that is fixed to the upper end portion of the cylindrical portion 22a and through which the plunger main body 32 of the first plunger 30 slidably passes. 22b. The upper lid 22 b closes a gap between the upper end portion of the cylindrical portion 22 a and the outer peripheral surface of the plunger main body 32. In this example, the cylindrical portion 22a has a cylindrical shape, and the upper lid 22b has an annular shape.

  A partition plate 23 that partitions the internal space of the base cylinder main body 22 up and down is fixed to the inner peripheral surface of the cylindrical portion 22a. A base cylinder oil chamber (base cylinder working fluid chamber) 101 filled with working oil (working fluid) is provided below the partition plate 23 in the base cylinder body 22 (that is, between the partition plate 23 and the bottom plate 21). Is provided.

  The cylindrical portion 22a is provided with an injection hole 26 for injecting hydraulic oil into the base cylinder oil chamber 101 and a base cylinder discharge hole 201 for discharging the hydraulic oil in the base cylinder oil chamber 101 to the outside. It has been. The injection hole 26 and the base cylinder discharge hole 201 communicate with the inside of the base cylinder oil chamber 101 and the outside. The injection hole 26 is provided at a position higher than the base cylinder discharge hole 201. In this example, the injection hole 26 is provided in the upper side portion of the base cylinder oil chamber 101, and the base cylinder discharge hole 201 is provided in the lower side portion of the base cylinder oil chamber 101. A lid 27 for preventing hydraulic oil from flowing out of the base cylinder oil chamber 101 is detachably provided at the injection port of the injection hole 26. A lid 202 for preventing hydraulic oil from flowing out of the base cylinder oil chamber 101 is detachably provided at the discharge port of the base cylinder discharge hole 201.

  The piston 31 of the first plunger 30 exists between the partition plate 23 in the base cylinder body 22 and the upper lid 22b. In this example, the shape of the piston 31 is a disc shape that contacts the inner surface of the cylindrical portion 22 a of the base cylinder body 22. A plunger projecting portion 34 is fixed to the first plunger 30 so as to project downward from the piston 31 and slidably penetrate the partition plate 23. In the plunger protrusion 34, a plunger protrusion oil chamber (plunger protrusion hydraulic fluid chamber) 102 is provided. Further, a control hole 25 is provided at the bottom of the plunger protrusion 34 to allow communication between the base cylinder oil chamber 101 and the plunger protrusion oil chamber 102.

  A control rod 24 passed through the control hole 25 is fixed to the bottom plate 21 of the base cylinder 20. The cross-sectional area of the control rod 24 is continuously reduced upward. Thus, the clearance between the outer peripheral surface of the control rod 24 and the inner peripheral surface of the control hole 25 is such that the plunger protrusion 34 approaches the bottom plate 21 (that is, the plunger protrusion 34 moves downward with respect to the base cylinder 20). It becomes smaller as it is displaced. The plunger protrusion 34 moves the hydraulic oil between the base cylinder oil chamber 101 and the plunger protrusion oil chamber 102 through the gap between the outer peripheral surface of the control rod 24 and the inner peripheral surface of the control hole 25. The base cylinder 20 is displaced.

  The return spring 60 is disposed in a space between the partition plate 23 and the piston 31 in the base cylinder body 22. Further, the return spring 60 is disposed in a state of surrounding the plunger protrusion 34. Further, the return spring 60 is contracted between the partition plate 23 and the piston 31 to generate an elastic restoring force. The first plunger 30 and the plunger protrusion 34 are biased upward with respect to the base cylinder 20 by receiving the elastic restoring force of the return spring 60.

  The plunger main body 32 of the first plunger 30 is fixed to the cylindrical portion 32a fixed to the upper surface of the piston 31 and the upper end of the cylindrical portion 32a, and the plunger main body 42 of the second plunger 40 is slidable. And an upper lid 32b penetrating therethrough. The upper lid 32 b closes a gap between the upper end portion of the cylindrical portion 32 a and the outer peripheral surface of the plunger main body 42. In this example, the cylindrical portion 32a has a cylindrical shape, and the upper lid 32b has an annular shape.

  The plunger main body 42 of the second plunger 40 is a cylindrical part having an open top. In this example, the shape of the cylindrical part which is the plunger main body 42 is cylindrical. In this example, the shape of the piston 41 of the second plunger 40 is a disk shape that contacts the inner peripheral surface of the cylindrical portion 32 a of the first plunger 30. Furthermore, the shape of the piston 51 of the third plunger 50 is also a disk shape that contacts the inner peripheral surface of the plunger main body 42 that is a cylindrical portion of the second plunger 40.

  Inside the plunger main body 32 of the first plunger 30, the volume is reduced in accordance with the downward displacement of the piston 41 of the second plunger 40 (that is, the second plunger 40 adjacent to the upper side). An oil chamber (inner chamber) 111 is provided. The inner oil chamber 111 is a space surrounded by the inner peripheral surface of the cylindrical portion 32a, the upper surface of the piston 31, and the lower surface of the piston 41 that is one step higher. The volume of the inner oil chamber 111 changes according to the displacement of the second plunger 40 relative to the first plunger 30.

  Between the plunger main body 32 of the first plunger 30 and the base cylinder main body 22 one step below, an outer oil chamber (outer chamber) 112 whose volume increases in accordance with the downward displacement of the first plunger 30 is provided. It has been. The outer oil chamber 112 is a space surrounded by the outer peripheral surface of the plunger main body 32, the upper surface of the piston 31, the inner peripheral surface of the cylindrical portion 22a, and the lower surface of the upper lid 22b. The volume of the outer oil chamber 112 changes according to the displacement of the first plunger 30 with respect to the base cylinder 20.

  The inner oil chamber 111 and the outer oil chamber 112 are filled with hydraulic oil (hydraulic fluid). A communication hole 35 that communicates the inside of the inner oil chamber 111 and the inside of the outer oil chamber 112 is provided at a lower portion (portion in the vicinity of the piston 31) of the cylindrical portion 32 a of the first plunger 30. The first plunger 30 is displaced with respect to the base cylinder 20 while moving the hydraulic oil through the communication hole 35 between the inner oil chamber 111 and the outer oil chamber 112.

  The upper lid 22 b of the base cylinder 20 is provided with an injection hole 36 for injecting hydraulic oil into the outer oil chamber 112. The injection hole of the injection hole 36 is formed on the upper surface of the upper lid 22b. A lid 37 for preventing the hydraulic oil from flowing out of the outer oil chamber 112 through the injection hole 36 is detachably provided at the injection port of the injection hole 36.

  Inside the plunger main body 42 of the second plunger 40, the volume decreases in accordance with the downward displacement of the piston 51 of the third plunger 50 (that is, the third plunger 50 adjacent to the upper side). An oil chamber (inner chamber) 121 is provided. The inner oil chamber 121 is a space surrounded by the inner peripheral surface of the plunger main body 42 that is a cylindrical portion, the upper surface of the piston 41, and the lower surface of the piston 51 that is one step higher. The volume of the inner oil chamber 121 changes according to the displacement of the third plunger 50 with respect to the second plunger 40.

  Between the plunger main body 42 of the second plunger 40 and the plunger main body 32 one step below, an outer oil chamber (outer chamber) 122 whose volume increases in accordance with the downward displacement of the second plunger 40 is provided. ing. The outer oil chamber 122 is a space surrounded by the outer peripheral surface of the plunger main body 42, the upper surface of the piston 41, the inner peripheral surface of the cylindrical portion 32a, and the lower surface of the upper lid 32b. The volume of the outer oil chamber 122 changes according to the displacement of the second plunger 40 with respect to the first plunger 30.

  The inner oil chamber 121 and the outer oil chamber 122 are filled with hydraulic oil (hydraulic fluid). A communication hole 45 that communicates the inside of the inner oil chamber 121 and the inside of the outer oil chamber 122 is provided in a lower portion (portion in the vicinity of the piston 41) of the cylindrical portion 42a of the second plunger 40. The second plunger 40 is displaced with respect to the first plunger 30 while moving the hydraulic oil through the communication hole 45 between the inner oil chamber 121 and the outer oil chamber 122.

  The upper lid 32 b of the first plunger 30 is provided with an injection hole 46 for injecting hydraulic oil into the outer oil chamber 122. The injection hole of the injection hole 46 is formed on the upper surface of the upper lid 32b. A lid 47 for preventing the hydraulic oil from flowing out of the outer oil chamber 122 through the injection hole 46 is detachably provided at the injection hole of the injection hole 46.

  The lids 27, 37, and 47 provided at the injection ports of the injection holes 26, 36, and 46 are in the contracted state (the contracted state) and the extended state (the extended state), respectively, of the car shock absorber 10. In any state, it is exposed to the outside. The configuration of the counterweight buffer 11 is the same as that of the car buffer 10.

  Next, the operation will be described. At normal times, as shown in FIG. 2, the first plunger 30 is displaced upward with respect to the base cylinder 20 by the urging force of the return spring 60, and the second plunger 40 is displaced relative to the first plunger 30. As the third plunger 50 is displaced upward with respect to the second plunger 40 by the pressure of the hydraulic oil, the car shock absorber 10 is held in an extended state. Similarly, the counterweight buffer 11 is held in an extended state.

  When the descending car 3 collides with the shock absorbing member 53 of the car shock absorber 10 due to some abnormality, the piston 51 of the third plunger 50 is pushed down with respect to the second plunger 40 by the collision force received from the car 3. . As a result, the pressure in the inner oil chamber 121 of the second plunger 40 increases.

  When the pressure in the inner oil chamber 121 of the second plunger 40 increases, the piston 41 of the second plunger 40 is pushed down with respect to the first plunger 30. Thereby, while the volume of the inner oil chamber 121 of the second plunger 40 is decreased, the volume of the outer oil chamber 122 adjacent to the piston 41 of the second plunger 40 is increased, and the operation in the inner oil chamber 121 is increased. Oil moves into the outer oil chamber 122 through the communication hole 45.

  When the second plunger 40 is pushed down relative to the first plunger 30, the pressure in the inner oil chamber 111 of the first plunger 30 increases. When the pressure in the inner oil chamber 111 becomes stronger than the urging force of the return spring 60, the first plunger 30 is pushed down with respect to the base cylinder body 22.

  When the first plunger 30 is pushed down with respect to the base cylinder main body 22, the volume of the inner oil chamber 111 of the first plunger 30 is reduced, as in the operation of the second plunger 40. The volume of the outer oil chamber 112 adjacent to the top of the piston 31 increases, and the hydraulic oil in the inner oil chamber 111 moves into the outer oil chamber 112 through the communication hole 35.

  When the first plunger 30 is pushed down with respect to the base cylinder body 22, the plunger protrusion 34 is also pushed down with respect to the base cylinder body 22. Thereby, the volume of the base cylinder oil chamber 101 is reduced, and the hydraulic oil in the base cylinder oil chamber 101 passes through the gap between the inner peripheral surface of the control hole 25 and the outer peripheral surface of the control rod 24, and the plunger protrusion It moves into the oil chamber 102.

  The first to third plungers 30, 40, 50 are pushed down almost simultaneously, and the first to third plungers 30, 40, 50 are pushed down with respect to the base cylinder 20. The state becomes a contracted state.

  When the third plunger 50 is pushed down with respect to the second plunger 40, the hydraulic oil passes through the communication hole 45 and a resistance force is generated. Further, when the second plunger 40 is pushed down with respect to the first plunger 30, the hydraulic oil passes through the communication hole 35 so that a resistance force is generated. Further, when the first plunger 30 is pushed down with respect to the base cylinder 20, the hydraulic oil passes through the gap between the control hole 25 and the control rod 24, so that a resistance force is generated. When the first plunger 30 is pushed down with respect to the base cylinder 20, the size of the gap between the control hole 25 and the control rod 24 is reduced. Increases in accordance with the displacement of the first plunger 30 relative to. The car shock absorber 10 decelerates the car 3 that has collided with the car shock absorber 10 at a deceleration determined by the regulations by these resistance forces.

  When the car shock absorber 10 is returned from the contracted state to the extended state, the car 3 that has collided with the car shock absorber 10 is raised, and the car 3 is separated from the car shock absorber 10 upward.

  When the car 3 moves away from the car shock absorber 10 and no load is applied to the car shock absorber 10, the first plunger 30 is pushed up with respect to the base cylinder body 22 by the urging force of the return spring 60. The plunger 30 returns to the original position.

  At this time, while the first plunger 30 returns to the original position, the hydraulic oil in the plunger protruding portion oil chamber 102 returns to the original base cylinder oil chamber 101, and the hydraulic oil in the outer oil chamber 112 becomes the first. Return to the inside oil chamber 111 of the plunger 30 of one.

  When the hydraulic oil in the outer oil chamber 112 returns to the inner oil chamber 111 of the first plunger 30, the second plunger 40 is pushed up with respect to the first plunger 30 by the pressure of the hydraulic oil in the inner oil chamber 111. Then, the second plunger 40 returns to the original position. At this time, the hydraulic oil in the outer oil chamber 122 returns to the inner oil chamber 121 of the second plunger 40 while the second plunger 40 returns to the original position.

  When the hydraulic oil in the outer oil chamber 122 returns into the inner oil chamber 121 of the second plunger 40, the third plunger 50 is pushed up with respect to the second plunger 40 by the pressure of the hydraulic oil in the inner oil chamber 121. Then, the third plunger 50 returns to the original position.

  In this way, the first to third plungers 30, 40, 50 are pushed up and returned together, and the car shock absorber 10 returns from the contracted state to the extended state. The operation of the counterweight buffer 11 is the same as the operation of the car buffer 10.

  Next, an installation method for installing the car shock absorber 10 in the pit portion of the hoistway 1 will be described. FIG. 3 is a cross-sectional view showing a state where the car shock absorber 10 of FIG. 1 is installed in the pit portion of the hoistway 1. Before the car shock absorber 10 is carried into the pit portion of the hoistway 1, the biasing force of the return spring 60 in a state before the hydraulic oil is injected into the car shock absorber 10 (the state where no hydraulic oil is injected). On the other hand, the first to third plungers 30, 40, 50 are displaced in a direction approaching the bottom plate 21 of the base cylinder 20 to keep the entire car shock absorber 10 in a contracted state. Further, as shown in FIG. 3, the contracted state of the car shock absorber 10 is held by a holder 71 so that the car shock absorber 10 does not extend by the urging force of the return spring 60. When the state of the car shock absorber 10 is in the contracted state, as shown in FIG. 3, the respective volumes of the inner oil chambers 111 and 121 are very small, and the respective volumes of the outer oil chambers 112 and 122 are respectively small. Is getting bigger. Even when the car shock absorber 10 is in the contracted state, the lids 27, 37, 47 provided at the inlets of the inlet holes 26, 36, 46 are exposed to the outside, so that the car buffer is provided. The hydraulic oil can be injected into the vessel 10.

  The holder 71 includes an attachment portion 72 that is detachably attached to the bottom plate 21 of the base cylinder 20, and an engagement portion 73 that is provided on the attachment portion 72 and engages with the upper portion of the first plunger 30. . In this example, the attachment portion 72 is attached vertically to the bottom plate 21, and the engaging portion 73 protrudes in parallel with the bottom plate 21 from the upper end portion of the attachment portion 72. In this example, the attachment portion 72 is detachably attached to the bottom plate 21 with a bolt.

  The first plunger 30 is held in a state of being pushed down with respect to the base cylinder 20 against the urging force of the return spring 60 by being engaged with the engaging portion 73 of the holder 71 attached to the bottom plate 21. Has been. The second and third plungers 40, 50 are displaced downward by their own weight with respect to the base cylinder 20, and are not engaged with the holder 71 (installation contraction step).

  Thereafter, the car shock absorber 10 held in a contracted state by the holding tool 71 is carried into the pit portion of the hoistway 1, and the car shock absorber 10 is disposed at an installation location in the pit portion of the hoistway 1. At this time, the bottom plate 21 of the base cylinder 20 is fixed to the bottom surface of the pit portion of the hoistway 1 with bolts or the like (arrangement step).

  Thereafter, the scaffold 81 is assembled on the bottom plate 21 of the base cylinder 20 or the bottom surface of the pit portion of the hoistway 1. The height of the scaffold 81 is approximately the same as the height of the car shock absorber 10 in the contracted state.

  After assembling the scaffold 81, hydraulic oil is injected into the car shock absorber 10 using the scaffold 81 while holding the contracted state of the car shock absorber 10 with the holder 71. That is, using the scaffold 81, hydraulic oil is injected from the injection hole 26 into the base cylinder oil chamber 101, from the injection hole 36 into the outer oil chamber 112, and from the injection hole 46 into the outer oil chamber 122. At this time, since the respective volumes of the base cylinder oil chamber 101 and the outer oil chambers 112 and 122 are not enlarged and changed, the base cylinder oil chamber 101 and the outer oil chambers 101 and 122 are not changed without applying pressure to the hydraulic oil by a hydraulic pump or the like. Sufficient hydraulic fluid can be injected into the chambers 112 and 122 only by gravity. Thereafter, the injection holes 26, 36, 46 are closed with lids 27, 37, 47 (working fluid injection process).

  Thereafter, the retainer 71 is removed from the car shock absorber 10 to release the contracted state of the car shock absorber 10. As a result, the first to third plungers 30, 40, 50 are pushed up with respect to the base cylinder 20 by the urging force of the return spring 60 and the pressure of the hydraulic oil, and the state of the car shock absorber 10 is automatically expanded. Become. At this time, each of the first to third plungers 30, 40, 50 receives a resistance force when the hydraulic oil passes through the communication holes 35, 45, and thus rises at a low speed (installation release step).

  When the elevator is installed, the car 3 and the counterweight 4 are assembled in the hoistway 1. Therefore, the scaffold 81 is also used for assembling the car 3 and the counterweight 4. That is, the scaffold 81 is used both for injecting hydraulic oil into the car shock absorber 10 and for assembling the car 3 and the counterweight 4.

  Thereafter, the scaffold 81 is removed from the pit portion of the hoistway 1 to complete the installation of the car shock absorber 10. The counterweight shock absorber 11 is also installed in the pit portion of the hoistway 1 in the same manner as the car shock absorber 10.

  In the car shock absorber 10, the hydraulic oil may decrease or the hydraulic oil may deteriorate due to long-term use. In this case, at the time of maintenance work of the elevator, additional hydraulic oil is injected into the car shock absorber 10 or the hydraulic oil in the car shock absorber 10 is discharged and new hydraulic oil is injected into the car shock absorber 10. There is a need.

  Next, a maintenance method for injecting hydraulic oil into the car shock absorber 10 already installed in the pit portion of the hoistway 1 will be described.

  In this embodiment, the control of the control device is designed in advance so that the car 3 can be moved downward from the moving range of the car 3 during normal operation only during maintenance operation. That is, the control of the control device is designed in advance so that the car 3 can move downward from the position of the lowest floor only during the maintenance operation.

  4 is a cross-sectional view showing a state where the car shock absorber 10 of FIG. When the hydraulic oil in the car shock absorber 10 is discharged, as shown in FIG. 4, the car 3 is moved downward from the lowermost floor under the control of the control device, and the lower surface of the car 3 is moved to the third uppermost stage. After making contact with the plunger 50, the car 3 is lowered at a low speed while pushing the third plunger 50 with the weight of the car 3, and the car shock absorber 10 is pushed and shrunk so that the whole car shock absorber 10 is in a contracted state ( Maintenance contraction process).

  Thereafter, the lid 47 of the injection hole 46 provided in the second plunger 40 is removed, and the car 3 is raised. FIG. 5 is a cross-sectional view showing a state where the car 3 is lifted with the lid 47 of the injection hole 46 of FIG. 4 removed. When the car shock absorber 10 is pushed and shrunk by the car 3 and the car 3 is lifted with the lid 47 of the injection hole 46 removed, the first plunger 30 is displaced upward by the urging force of the return spring 60. Then, the second plunger 40 is displaced upward by the pressure of the hydraulic oil.

  When the second plunger 40 is displaced upward, the pressure in the inner oil chamber 111 of the first plunger 30 and the dead weight of the third plunger 50 cause the inside of the inner oil chamber 121 and the outer oil chamber 122. The hydraulic oil in the outer oil chamber 122 is discharged to the outside through the opened injection hole 46 without the third plunger 50 ascending with respect to the second plunger 40 by pushing the hydraulic oil inside. .

  Thereafter, when the cover 37 of the injection hole 36 provided in the base cylinder body 22 is removed in a state where the hydraulic oil is discharged from the inside of the inner oil chamber 121 and the outer oil chamber 122, the urging force of the return spring 60 is reduced. The hydraulic oil in the inner oil chamber 111 and the outer oil chamber 112 is pushed by the dead weights of the second and third plungers 40 and 50, so that the hydraulic oil in the outer oil chamber 112 is opened through the opened injection hole 36. Are discharged to the outside, the second and third plungers 40 and 50 are lowered with respect to the first plunger 30. As a result, the car shock absorber 10 enters a contracted state as shown in FIG.

  The hydraulic oil in the base cylinder oil chamber 101 and the plunger protruding portion oil chamber 102 is discharged to the outside by removing the lid 202 of the base cylinder discharge hole 201. As a result, the hydraulic oil in the car shock absorber 10 is discharged (maintenance hydraulic fluid discharging step).

  When hydraulic oil is injected into the car shock absorber 10 after the hydraulic oil is discharged, or when additional hydraulic oil is injected into the car shock absorber 10 where the hydraulic oil has decreased, the third plunger 50 at the uppermost stage is moved to the car. The car 3 is lowered at a low speed while being pushed with a weight of 3, and the car shock absorber 10 is pushed and shrunk to bring the entire car shock absorber 10 into a contracted state (contraction step during maintenance).

  Thereafter, the hydraulic oil is injected into the car shock absorber 10 while maintaining the contracted state of the car shock absorber 10 in the same manner as the hydraulic fluid injection process when the car shock absorber 10 is installed. That is, hydraulic oil is injected from the injection hole 26 into the base cylinder oil chamber 101, from the injection hole 36 into the outer oil chamber 112, and from the injection hole 46 into the outer oil chamber 122. Thereafter, the injection holes 26, 36, 46 are closed with lids 27, 37, 47 (working fluid injection process).

  Thereafter, the car 3 is lifted to release the contracted state of the car shock absorber 10. As a result, the first to third plungers 30, 40, 50 are pushed up with respect to the base cylinder 20 by the urging force of the return spring 60 and the pressure of the hydraulic oil, and the state of the car shock absorber 10 is automatically expanded. (Release process during maintenance)

  The existing counterweight buffer 11 is also discharged and injected with hydraulic oil in the same manner as the existing car buffer 10. Therefore, in this embodiment, in order to allow the hydraulic oil to be discharged and injected into the existing counterweight buffer 11, the counterweight is balanced below the moving range of the counterweight 4 during normal operation. Control of the control device is designed in advance so that the weight 4 can be moved only during the maintenance operation. That is, the control of the control device is designed in advance so that the counterweight 4 can move downward from the position of the lowest floor only during the maintenance operation.

  In such a car shock absorber 10, each of the base cylinder body 22 of the base cylinder 20 and the plunger body 32 of the first plunger 30 is a hollow portion, and an injection hole 36 is provided in the upper portion of the base cylinder body 22. Since the injection hole 46 is provided in the upper part of the plunger main body 32, when the hydraulic oil is injected into the outer oil chamber 112 and the outer oil chamber 122, the operation is performed from the injection holes 36 and 46. Oil can be prevented from flowing back. Thus, sufficient hydraulic oil can be injected into each of the outer oil chamber 112 and the outer oil chamber 122 without using a hydraulic pump or the like for forcibly applying pressure to the hydraulic oil. The operation of injecting hydraulic oil to 10 can be facilitated. In particular, in this example, the injection port of the injection hole 36 is provided on the upper surface of the base cylinder body 22 (upper surface of the upper lid 22b), and the injection port of the injection hole 46 is formed on the upper surface of the plunger main body 32 (upper surface of the upper lid 32b). Since it is provided, for example, compared with the case where the injection port of the injection hole 36 is provided on the side surface of the plunger main body 32, the injection port of the injection hole 46 does not interfere with the sliding portion of the base cylinder main body 22. The margin dimension for making it unnecessary becomes unnecessary about the 1st plunger 30, and the 1st plunger 30 can be shortened.

  Moreover, not only can a device such as a hydraulic pump be made unnecessary, but also all the working oil can be injected while maintaining the contracted state of the car shock absorber 10. The height dimension of the scaffold 81 used for injecting the scaffold can be reduced, and the labor for assembling the scaffold 81 can be reduced. Thereby, the cost for installation or maintenance of the car shock absorber 10 can be reduced. Note that the same effect as the car shock absorber 10 can be obtained with respect to the counterweight shock absorber 11.

  Further, in such a method of installing the car shock absorber 10, the contracted state of the car shock absorber 10 is held by the holding tool 71, and after the car shock absorber 10 is arranged at the installation location in the pit portion of the hoistway 1, each injection The hydraulic oil is injected into the outer oil chambers 112 and 122 from the holes 36 and 46, and the retainer 71 is detached from the car shock absorber 10 to release the cage shock absorber 10 from being held in a contracted state. Without using a hydraulic pump or the like for supplying to the car buffer, it is possible to inject sufficient hydraulic oil into each of the outer oil chamber 112 and the outer oil chamber 122, thereby facilitating the operation of injecting hydraulic oil into the car shock absorber 10. can do. Further, not only can a device such as a hydraulic pump be made unnecessary, but also the operation of injecting all the hydraulic oil can be performed while maintaining the contracted state of the car shock absorber 10, so the car shock absorber 10 is installed. For this reason, the cost can be reduced. In addition, also about the installation method of the counterweight buffer 11, the effect similar to the installation method of the cage buffer 10 can be acquired.

  Further, in such a maintenance method of the car shock absorber 10, the car 3 is lowered to bring the entire car shock absorber 10 into a contracted state, and then the working oil is supplied from the injection holes 36 and 46 to the outer oil chambers 112 and 122. Since the car 3 is lifted and the car shock absorber 10 is released from the contracted state, the car shock absorber 10 as a whole can be brought into a contracted state simply by lowering the car shock absorber 10 using a hydraulic pump or the like. In addition, sufficient hydraulic oil can be injected into each of the outer oil chamber 112 and the outer oil chamber 122. Further, the car shock absorber 10 can be brought into a contracted state by the weight of the car 3, and a dedicated tool for bringing the car shock absorber 10 into a contracted state can be eliminated. Thereby, the injection | pouring operation | work of the hydraulic oil with respect to the cage buffer 10 can be made easy. Further, not only can the hydraulic pump be unnecessary, but also the operation of injecting all the hydraulic oil can be performed while maintaining the contracted state of the car shock absorber 10, so that the car shock absorber 10 can be maintained. Cost can also be reduced. In addition, the same effect as the maintenance method of the car shock absorber 10 can be obtained with respect to the maintenance method of the counterweight shock absorber 11.

  In the above example, the injection port of the injection hole 36 is provided on the upper surface of the base cylinder body 22, and the injection port of the injection hole 46 is provided on the upper surface of the plunger body 32 of the first plunger 30. The injection port of the hole 36 may be provided on the upper side surface of the base cylinder body 22, and the injection port of the injection hole 46 may be provided on the upper side surface of the plunger body 32 of the first plunger 30.

  In the above example, three plungers (first to third plungers 30, 40, 50) are sequentially connected. However, the number of plungers is not limited to this, and the number of plungers is two or four. It may be more than one. For example, as shown in FIG. 7, two plungers (first and third plungers 30 and 50) may be sequentially connected. As shown in FIG. 8, four plungers (first to third plungers) are connected. Plungers 30, 40, 50 and additional plunger 90) may be connected in sequence.

  When the first and third plungers 30 and 50 are sequentially connected, the plunger body 52 of the third plunger 50 is disposed between the plunger body 32 of the first plunger 30 and the outer oil chamber as shown in FIG. Without passing through the upper part of the first plunger 30 through the gap.

  Moreover, when connecting the 1st-3rd plunger 30,40,50 and the additional plunger 90 sequentially, the additional plunger 90 is the 1st plunger 30 and the 2nd plunger 40, as shown in FIG. It is connected between. Similarly to the first plunger 30, the additional plunger 90 includes a plate-like piston 91, and a plunger main body 92 that has a cylindrical portion 92 a and an upper lid 92 b and is a hollow portion that extends upward from the piston 91. Have. The piston 91 is slidably disposed in the plunger main body 32 of the first plunger 30 one step below. In the plunger main body 92, the piston 41 of the second plunger 40 on the upper stage is slidably disposed, and an inner oil chamber (inner chamber) 131 whose volume is reduced according to the downward displacement of the piston 41 is provided. . Between the plunger main body 92 of the additional plunger 90 and the plunger main body 32 of the first plunger 30 one step below, an outer oil chamber (outer chamber) whose volume increases in accordance with the downward displacement of the additional plunger 90. 132 is provided. The cylindrical portion 92 a of the additional plunger 90 is provided with a communication hole 95 that allows communication between the inside of the inner oil chamber 131 and the inside of the outer oil chamber 132, and the upper lid 92 b of the additional plunger 90 has hydraulic fluid to the outer oil chamber 122. An injection hole 106 is provided for injecting. A lid 107 for preventing hydraulic oil from flowing out of the outer oil chamber 132 through the injection hole 106 is detachably provided at the injection port of the injection hole 106.

Embodiment 2. FIG.
FIG. 9 is a sectional view showing an elevator car shock absorber according to Embodiment 2 of the present invention. In the figure, a piston 31 of a first plunger 30 is slidably disposed in a base cylinder body 22. Between the piston 31 in the base cylinder main body 22 and the bottom plate 21, a pressure chamber (biasing body) 61 filled with high-pressure gas (compressed gas) is provided as a high-pressure gas tank. The pressure chamber 61 is a space surrounded by the cylindrical portion 22 a, the bottom plate 21, and the piston 31.

  The base cylinder body 22 is provided with a gas introduction part (not shown) for introducing gas into the pressure chamber 61. The gas introduction part is provided at a low position outside the movement range of the piston 31. Thereby, even if the state of the car shock absorber 10 is in either the expanded state or the contracted state, the gas can be introduced into the pressure chamber 61 from the gas introducing portion.

  The first plunger 30 is urged upward with respect to the base cylinder body 22 by the pressure of the gas filled in the pressure chamber 61. The return operation of the car shock absorber 10 is performed by the pressure of the gas in the pressure chamber 61. The configuration of the counterweight buffer 11 is the same as that of the car buffer 10, and the counterweight buffer 11 is also provided with a pressure chamber. In this embodiment, the partition plate 23, the control rod 24, the plunger protrusion 34, and the return spring 60 are not provided in the car shock absorber 10 and the counterweight shock absorber 11. Other configurations are the same as those in the first embodiment.

  Next, an installation method for installing the car shock absorber 10 in the pit portion of the hoistway 1 will be described. Before the car shock absorber 10 is carried into the pit portion of the hoistway 1, the state before the hydraulic oil and gas are put into the car shock absorber 10 (that is, the hydraulic oil and gas are not contained) is the first. The third plunger 30, 40, 50 is displaced in a direction approaching the bottom plate 21 of the base cylinder 20 to bring the entire car shock absorber 10 into a contracted state. At this time, the contracted state of the car shock absorber 10 is naturally held by gravity because the upward biasing force is not applied to the first to third plungers 30, 40, 50 (installation contraction process).

  Thereafter, as in the first embodiment, the placement step and the hydraulic fluid injection step are performed in this order, the car shock absorber 10 is placed at the installation location in the pit portion of the hoistway 1, and the hydraulic oil is placed in the car shock absorber 10. inject.

  Thereafter, gas is introduced into the pressure chamber 61 from the gas introduction portion of the base cylinder body 22. Thereby, the compressed gas is filled in the pressure chamber 61, and the first plunger 30 is biased upward with respect to the base cylinder body 22 by the pressure of the compressed gas in the pressure chamber 61. Thereby, the contracted state of the car shock absorber 10 is released, and the first to third plungers 30, 40, 50 are displaced upward, and the car shock absorber 10 enters the extended state (setting release process).

  As described above, even if the first plunger (lowermost plunger) 30 is urged upward with respect to the base cylinder body 22 by the pressure of the gas filled in the pressure chamber 61, The operation similar to that of the first embodiment can be obtained that the operation of injecting the hydraulic oil can be facilitated and the cost can be reduced. The same effect as the car shock absorber 10 can be obtained for the counterweight shock absorber 11 as well.

Embodiment 3 FIG.
FIG. 10 is a sectional view showing an elevator car shock absorber according to Embodiment 3 of the present invention. In the drawing, the piston 31 adjacent to the lower side of the outer oil chamber 112 has a piston discharge hole 38 for discharging hydraulic oil from the upper outer oil chamber 112 to a space adjacent to the lower side of the piston 31. It is provided at the bottom. The piston discharge hole 38 is closed by a plug (blocking body) 39 that can be attached to and detached from the piston 31. The piston discharge hole 38 is opened and closed by attaching and detaching the plug 39 to the piston 31. In this example, a piston discharge hole 38 is provided on the center line of the injection hole 36 provided in the upper part of the base cylinder body 22.

  Each of the outer peripheral surface of the stopper 39 and the inner peripheral surface of the piston discharge hole 38 is provided with a threaded portion. The stopper 39 is attached to the piston 31 in a state in which the piston discharge hole 38 is closed by being screwed into the piston discharge hole 38.

  The plug 39 can be attached to and detached from the piston 31 by a rod-like attachment / detachment tool (not shown) inserted into the outer oil chamber 112 from the injection hole 36. In this example, a hook is provided at the tip of the detachable tool, and a hook hole for hooking the hook of the detachable tool is provided on the top of the plug 39. The stopper 39 is attached to and detached from the piston 31 by being turned by the attaching / detaching tool while the collar portion of the attaching / detaching tool inserted into the outer oil chamber 112 is hooked on the hooking hole of the stopper 39.

  A piston discharge hole 48 for discharging hydraulic oil from the upper outer oil chamber 122 to a space adjacent to the lower side of the piston 41 is also provided in the lowermost portion of the outer oil chamber 122 in the piston 41 adjacent to the lower side of the outer oil chamber 122. Is provided. The piston discharge hole 48 is closed by a plug (blocking body) 49 that can be attached to and detached from the piston 41. The piston discharge hole 48 is opened and closed by attaching and detaching the plug 49 to the piston 41. In this example, the piston discharge hole 48 is provided on the center line of the injection hole 46 provided in the upper part of the plunger main body 32 of the first plunger 30.

  Each of the outer peripheral surface of the stopper 49 and the inner peripheral surface of the piston discharge hole 48 is provided with a threaded portion. The stopper 49 is attached to the piston 41 with the piston discharge hole 48 closed by being screwed into the piston discharge hole 48.

  The plug 49 can be attached to and detached from the piston 41 by the rod-like attachment / detachment tool inserted into the outer oil chamber 122 from the injection hole 46. The configuration of the plug 49 is the same as the configuration of the plug 39. The stopper 49 is attached to and detached from the piston 41 by being turned by the attaching / detaching tool in a state where the collar portion of the attaching / detaching tool inserted into the outer oil chamber 122 is hooked on the hooking hole of the stopper 49.

  The cylindrical portion 22 a of the base cylinder 20 is provided with an auxiliary discharge hole (external discharge hole) 203 that communicates the space between the partition plate 23 in the base cylinder body 22 and the piston 31 and the outside. That is, among the spaces in the base cylinder body 22 of the base cylinder 20, spaces that communicate with the outer oil chambers 112 and 122 by opening the piston discharge holes 38 and 48 (in this example, the space above the partition plate 23. ) Communicates with the outside through the auxiliary discharge hole 203 for discharging the hydraulic fluid to the outside. The position of the auxiliary discharge hole 203 is set in the vicinity of the partition plate 23 (the lower side portion of the space between the partition plate 23 and the piston 31 in the base cylinder body 22). A lid 204 for preventing hydraulic oil from flowing out of the space between the partition plate 23 in the base cylinder body 22 and the piston 31 is detachably provided at the discharge port of the auxiliary discharge hole 203. The configuration of the counterweight buffer 11 is the same as the configuration of the car buffer 10. Other configurations are the same as those in the first embodiment.

  When the hydraulic oil in the car shock absorber 10 is discharged, the stoppers 39 and 49 and the lid 204 are removed, and the piston discharge holes 38 and 48 and the auxiliary discharge hole 203 are opened. As a result, the hydraulic oil in each of the outer oil chambers 112 and 122 flows into the base cylinder body 22, and the hydraulic oil that has flowed into the base cylinder main body 22 from each of the outer oil chambers 112 and 122 naturally flows to the outside through the auxiliary discharge hole 203. Discharged. Further, by removing the lid 202 and opening the base cylinder discharge hole 201, the hydraulic oil in the base cylinder oil chamber 101 is naturally discharged to the outside through the base cylinder discharge hole 201. The hydraulic oil in the counterweight buffer 11 is also discharged in the same manner as when the hydraulic oil in the car buffer 10 is discharged.

  In such a car shock absorber 10, piston discharge holes 38 and 48 for discharging the working oil from the upper outer oil chambers 112 and 122 to the lower side of the pistons 31 and 41 are provided in the pistons 31 and 41. Since the plugs 39 and 49 for closing the valves 38 and 48 can be detached from the pistons 31 and 41 by means of a detachable tool inserted into the outer oil chambers 112 and 122 from the injection holes 36 and 46, only the plugs 39 and 49 are removed. Thus, the hydraulic oil in each of the outer oil chambers 112 and 122 can be naturally discharged to the outside only by gravity. Thereby, the injection | pouring operation | work of the hydraulic oil with respect to the cage buffer 10 can be made still easier. The same effect as the car shock absorber 10 can be obtained for the counterweight shock absorber 11 as well.

  In the above example, as the plugs 39 and 49 which are blocking bodies for closing the piston discharge holes 38 and 48, those provided with screw portions and attached / detached by rotation are exemplified, but an elastic member made of rubber or the like is used. The stoppers 39 and 49 may be used. In this case, the piston discharge holes 38 and 48 are closed by pushing the plugs 39 and 49 into the piston discharge holes 38 and 48 with a rod-shaped attachment and detachment tool. The piston discharge holes 38 and 48 are opened by pulling up the plugs 39 and 49 upward. Furthermore, a putty that closes the piston discharge holes 38 and 48 may be solidified to form a closed body.

  In addition, an on-off valve that opens and closes the piston discharge holes 38 and 48 may be a closed body. For example, the piston discharge holes 38 and 48 can be opened only while being pressed by the open / close valve that opens and closes the piston discharge holes 38 and 48 by rotating the valve handle with the attachment / detachment tool inserted from the injection holes 36 and 46. The opening / closing valve or the like to be opened may be a closed body.

  Further, in the above example, the piston discharge holes 38 and 48 are provided on the center line of the injection holes 36 and 46. However, the closure body is attached to and detached from the piston discharge holes 38 and 48, and the piston discharge holes 38 and 48 are opened and closed. If the operation is possible, the positions of the piston discharge holes 38 and 48 may not be directly below the injection holes 36 and 46. That is, the positions of the piston discharge holes 38 and 48 do not have to be directly below the injection holes 36 and 46 as long as the chain can be pulled up, or when a rod-shaped attachment / detachment tool is used. As long as the attachment / detachment tool reaches the obstruction body, it does not have to be directly under the injection holes 36 and 46. In addition, the plunger and the base cylinder are often formed as a concentric cylinder with respect to a common central axis because of strength advantages. In this case, the base cylinder and each plunger rotate to each other to inject. The positions of the holes 36 and 46 and the positions of the piston discharge holes 38 and 48 may be shifted in the circumferential direction. For this reason, in order to enable the piston discharge holes 38 and 48 to be opened and closed, the rotation of the plungers 30 and 40 is restricted, or the plungers 30 and 40 are forcibly rotated so that the injection holes 36 and 46 and the piston discharge are discharged. It is necessary to eliminate the circumferential shift generated between the holes 38 and 48.

  Here, the structure in the case of restricting the rotation of the plungers 30 and 40 will be described first. FIG. 11 is a top view showing an example in which a protrusion is provided on each of the first and second plungers 30 and 40 of the car shock absorber of FIG. A protrusion 301 is provided on the outer peripheral surface of the first plunger 30, and a protrusion 401 is provided on the outer peripheral surface of the second plunger 40. The protrusions 301 and 401 are arranged in parallel with the common central axis of the first and second plungers 30 and 40. A guide groove 302 in which the protrusion 301 is slidably fitted is provided on the inner peripheral surface of the upper lid 22 b of the base cylinder body 22. On the inner peripheral surface of the upper lid 32b of the plunger main body 32, a guide groove 402 into which the projection 401 is slidably fitted is provided. The rotation of the first and second plungers 30 and 40 in the circumferential direction is restricted by the protrusions 301 and 401 fitting into the guide grooves 302 and 402. Thereby, the occurrence of circumferential displacement between the injection holes 36, 46 and the piston discharge holes 38, 48 is prevented, and the piston discharge holes 38, 48 can be opened and closed.

  Next, a description will be given of a structure for forcibly rotating the plungers 30 and 40 to eliminate the circumferential shift between the injection holes 36 and 46 and the piston discharge holes 38 and 48. FIG. 12 is a cross-sectional view showing an example in which a handle for operation is provided on each of the first and second plungers 30 and 40 of the car shock absorber of FIG. FIG. 13 is a top view showing the car shock absorber of FIG. A plurality of (in this example, two) handles 303 are provided at the upper end of the outer peripheral surface of the first plunger 30, and a plurality of (in this example, 2 2) the upper end of the outer peripheral surface of the second plunger 40. A) handle 403 is provided. The handle 303 is a rod-like member protruding outward in the radial direction of the first plunger 30, and the handle 403 is a rod-like member protruding outward in the radial direction of the second plunger 40. The first and second plungers 30 and 40 are forcibly rotated around the common central axis by the operation of the handles 303 and 403. Even when the circumferential displacement between the injection holes 36 and 46 and the piston discharge holes 38 and 48 occurs, the injection holes 36 are rotated by the rotation of the first and second plungers 30 and 40 by the operation of the handles 303 and 403. , 46 and the piston discharge holes 38, 48 can be eliminated. The handles 303 and 403 may be detachable from the first and second plungers 30 and 40. In this way, the handles 303 and 403 are attached to the first and second plungers 30 and 40 only during maintenance, and the handles 303 and 403 are detached from the first and second plungers 30 and 40 during normal operation. I can leave.

  Next, a maintenance method for replacing the hydraulic oil in the car shock absorber 10 already installed in the pit portion of the hoistway 1 will be described.

  Under the control of the control device, the car 3 is moved below the lowermost floor so that the lower surface of the car 3 is brought into contact with the uppermost third plunger 50, and then the third plunger 50 is pushed by the weight of the car 3. While the car 3 is lowered at a low speed, the car shock absorber 10 is pushed and shrunk to bring the entire car shock absorber 10 into a contracted state. Thereafter, the plugs 39 and 49 and the lid 204 are removed, and the piston discharge holes 38 and 48 and the auxiliary discharge hole 203 are opened, so that the hydraulic oil in the outer oil chambers 112 and 122 passes through the auxiliary discharge hole 203 to the outside. Naturally discharged.

  The hydraulic oil in the base cylinder oil chamber 101 and the plunger protruding portion oil chamber 102 is discharged to the outside by removing the lid 202 of the base cylinder discharge hole 201. As a result, the hydraulic oil in the car shock absorber 10 is discharged (maintenance hydraulic fluid discharging step). Here, the auxiliary discharge hole 203 is an external discharge hole located at the lowermost part of the space that is integrated when the piston discharge holes 38 and 48 are opened. Therefore, if the hydraulic oil discharged from the auxiliary discharge hole 203 and the base cylinder discharge hole 201 is collected, maintenance work can be performed without polluting the elevator pit.

  After the hydraulic oil is discharged, the piston discharge holes 38 and 48 and the base cylinder discharge hole 201 are closed with the plugs 39 and 49 and the lid 204, respectively, and the car shock absorber 10 is kept in the contracted state while the car shock absorber 10 is kept in the contracted state. Inject hydraulic oil into That is, hydraulic oil is injected from the injection hole 26 into the base cylinder oil chamber 101, from the injection hole 36 into the outer oil chamber 112, and from the injection hole 46 into the outer oil chamber 122. Thereafter, the injection holes 26, 36, 46 are closed with lids 27, 37, 47 (working fluid injection process).

  Thereafter, the car 3 is lifted to release the contracted state of the car shock absorber 10. As a result, the first to third plungers 30, 40, 50 are pushed up with respect to the base cylinder 20 by the urging force of the return spring 60 and the pressure of the hydraulic oil, and the state of the car shock absorber 10 is automatically expanded. (Release process during maintenance)

  Further, this elevator shock absorber (multi-stage shock absorber) is used for an elevator having a very high speed, and when a plurality of plungers are used, it has a very large total length corresponding to the fifth floor of the building. By using this work procedure, the operation of injecting and discharging hydraulic oil can be made more efficient. This also has the same effect in other embodiments.

Embodiment 4 FIG.
FIG. 14 is a sectional view showing an elevator car shock absorber according to Embodiment 4 of the present invention. FIG. 15 is a cross-sectional view showing a state where the piston discharge holes 38 and 48 of FIG. 14 are opened. 16 is a top view showing the piston 41 of FIG. 14, and FIG. 17 is a top view showing the piston 41 of FIG. In the figure, the piston 31 adjacent below the outer oil chamber 112 has a piston main body disk 311 provided in the plunger main body 32 and an opening / closing disk 312 superimposed on the piston main body disk 311. . The piston main body disk 311 and the opening / closing disk 312 are rotatably connected to each other by a rotation shaft 313 disposed on a common central axis A. As a result, the opening / closing disc 312 is rotatable about the central axis A with respect to the piston body disc 311.

  The piston body disk 311 is provided with a first through hole 38a, and the opening / closing disk 312 is provided with a second through hole 38b. The piston discharge hole 38 includes a first through hole 38a and a second through hole 38b. The distances between the first through hole 38a and the second through hole 38b and the central axis A are equal to each other. The position of the second through hole 38b with respect to the first through hole 38a changes in the circumferential direction by the rotation of the opening / closing disk 312 with respect to the piston main body disk 311. The piston discharge hole 38 is closed by shifting the positions of the first through hole 38a and the second through hole 38b in the circumferential direction, and the positions of the first through hole 38a and the second through hole 38b. Are released by matching in the circumferential direction.

  The piston main body disk 311 is fixed to the cylindrical portion 32a of the first plunger 30 in both the vertical direction and the rotational direction. Further, the piston main body disk 311 is slidable while being in contact with the inner peripheral surface of the cylindrical portion 22a of the base cylinder main body 22 so that the hydraulic oil does not leak. On the other hand, the opening / closing disk 312 is fixed only in the vertical direction with respect to the cylindrical portion 32 a of the first plunger 30. The plunger protrusion 34 is fixed to the opening / closing disk 312.

  The piston 41 adjacent to the lower side of the outer oil chamber 122 includes a piston main body disk 411 provided on the plunger main body 42 and an opening / closing disk 412 stacked on the piston main body disk 411. The piston main body disk 411 and the opening / closing disk 412 are rotatably connected to each other by a rotation shaft 413 disposed on a common central axis A. Thereby, the opening / closing disk 412 is rotatable about the central axis A with respect to the piston main body disk 411.

  The piston body disk 411 is provided with a first through hole 48a, and the opening / closing disk 412 is provided with a second through hole 48b. The piston discharge hole 48 includes a first through hole 48a and a second through hole 48b. The distances between the first through hole 48a and the second through hole 48b and the central axis A are equal to each other. The position of the second through hole 48b with respect to the first through hole 48a changes in the circumferential direction by the rotation of the opening / closing disk 412 with respect to the piston main body disk 411. The piston discharge hole 48 is closed as shown in FIGS. 14 and 16 when the positions of the first through hole 48a and the second through hole 48b are shifted in the circumferential direction, and the first through hole 48a and the second through hole 48a are closed. When the positions of the two through holes 48b coincide with each other in the circumferential direction, they are opened as shown in FIGS.

  The piston main body disk 411 is fixed to the cylindrical plunger main body 42 of the second plunger 40 in both the vertical direction and the rotation direction. The piston main body disk 411 is slidable in contact with the inner peripheral surface of the cylindrical portion 32a of the first plunger 30 so that the hydraulic oil does not leak. On the other hand, the opening / closing disc 412 is fixed only in the vertical direction with respect to the cylindrical plunger main body 42 of the second plunger 40. Other configurations are the same as those of the third embodiment.

  When the hydraulic oil in the car shock absorber 10 is discharged, the auxiliary discharge hole 203 is opened, and the car shock absorber 10 is contracted by moving the car 3 downward from the lowest floor as in the third embodiment. State. In this state, the first plunger 30 is rotated about the central axis A, so that the positions of the first and second through-holes 38a and 38b of the piston 31 coincide with each other in the circumferential direction, and the piston discharge hole 38 is opened. At the same time, by rotating the second plunger 40 about the central axis A, the positions of the first and second through holes 48a and 48b of the piston 41 are made to coincide with each other in the circumferential direction, and the piston discharge hole 48 is opened. . As a result, the hydraulic oil in each of the outer oil chambers 112 and 122 is naturally discharged to the outside through the auxiliary discharge hole 203. Further, by removing the lid 202 and opening the base cylinder discharge hole 201, the hydraulic oil in the base cylinder oil chamber 101 is naturally discharged to the outside through the base cylinder discharge hole 201.

Embodiment 5 FIG.
FIG. 18 is a sectional view showing an elevator car shock absorber according to Embodiment 5 of the present invention. FIG. 19 is a cross-sectional view showing a contracted state of the car shock absorber of FIG. In the figure, the piston 41 adjacent to the lower side of the outer oil chamber 122 is provided with a piston discharge hole 48 for discharging the working oil from the upper outer oil chamber 122 to the lower side of the piston 41 at the lowermost portion of the outer oil chamber 122. It has been. The piston discharge hole 48 is closed by a plug (blocking body) 49 that can be attached to and detached from the piston 41. In this example, a piston discharge hole 48 is provided on the center line of the injection hole 46 provided in the upper part of the base cylinder body 32.

  Each of the outer peripheral surface of the stopper 49 and the inner peripheral surface of the piston discharge hole 48 is provided with a threaded portion. The stopper 49 is attached to the piston 41 with the piston discharge hole 48 closed by being screwed into the piston discharge hole 48.

  The stopper 49 can be attached to and detached from the piston 41 by a rod-like attachment / detachment tool (not shown) inserted into the outer oil chamber 122 from the injection hole 46. In this example, a hook is provided at the tip of the detachable tool, and a hook hole for hooking the hook of the detachable tool is provided at the top of the plug 49. The stopper 49 is attached to and detached from the piston 41 by being turned by the attaching / detaching tool while the collar portion of the attaching / detaching tool inserted into the outer oil chamber 112 is hooked on the hooking hole of the stopper 49.

  An external discharge hole 205 is provided in the cylindrical portion 22 a of the base cylinder 20. Of the space in the base cylinder body 22 of the base cylinder 20, the space (in this example, the outer oil chamber 112) that communicates with the outer oil chamber 122 by opening the piston discharge hole 48 discharges hydraulic fluid to the outside. The external discharge hole 205 communicates with the outside. The external discharge hole 205 allows the outer oil chamber 112 to communicate with the outside when the entire car shock absorber 10 is in a contracted state. Therefore, the position of the external discharge hole 205 is higher than the position of the piston 31 in the state where the car shock absorber 10 is compressed to the maximum.

  A lid 206 for preventing the hydraulic oil from flowing out is detachably provided at the discharge port of the external discharge hole 205. Other configurations are the same as those of the second embodiment. The configuration of the counterweight buffer 11 is the same as the configuration of the car buffer 10.

  When the hydraulic oil in the car shock absorber 10 is discharged, the car 3 is moved downward from the lowest floor in the same manner as in the third embodiment, and the entire car shock absorber 10 is contracted as shown in FIG. Then, the cover 206 and the stopper 49 are removed, and the external discharge hole 205 and the piston discharge hole 48 are opened, so that the hydraulic oil is naturally discharged to the outside through the external discharge hole 205. The hydraulic oil in the counterweight buffer 11 is also discharged in the same manner as when the hydraulic oil in the car buffer 10 is discharged.

  In such a car shock absorber 10, a piston discharge hole 48 for discharging hydraulic oil from the upper outer oil chambers 112, 122 to the lower side of the piston 41 is provided in the piston 41, and a plug 49 that closes the piston discharge hole 48 is provided. Since the piston 41 is detachable by a detachable tool inserted into the outer oil chamber 122 from the injection hole 46, the outer oil chambers 112 and 122 can be removed by simply removing the cap 49 and the lid 206 of the external discharge hole 205. Hydraulic oil can be discharged naturally by gravity alone. Thereby, the exchange operation | work of the hydraulic fluid with respect to the cage | basket | car buffer 10 can be made still easier. The same effect as the car shock absorber 10 can be obtained for the counterweight shock absorber 11 as well.

Embodiment 6 FIG.
FIG. 20 is a sectional view showing an elevator car shock absorber according to Embodiment 6 of the present invention. In the figure, an outer wall 28 surrounding the outer periphery of the base cylinder body 22 is provided on the bottom plate 21 of the base cylinder 20. The outer wall portion 28 includes an outer cylindrical portion 28a that surrounds the outer periphery of the cylindrical portion 22a of the base cylinder body 22 and forms a space with the cylindrical portion 22a, and an upper end portion and an upper lid 22b of the outer cylindrical portion 28a. And a plate-like pressure lid 28b that closes the space therebetween. In this example, the cylindrical portion 22a and the outer cylindrical portion 28a are arranged coaxially.

  A base cylinder oil chamber 101 is provided between the piston 31 and the bottom plate 21. In the space between the cylindrical portion 22a and the outer cylindrical portion 28a, a piston 62 which is an annular plate along the outer periphery of the cylindrical portion 22a is provided so as to be slidable in the vertical direction.

  Between the piston 62 and the pressure lid 28b, a pressure chamber (biasing body) 61 filled with a high-pressure gas (compressed gas) is provided as a high-pressure gas tank. The pressure chamber 61 is a space surrounded by the cylindrical portion 22 a, the outer cylindrical portion 28 a, the pressure lid 28 b, and the piston 62.

  A cylinder outer oil chamber 103 is provided between the piston 62 and the bottom plate 21. A communication hole 104 that communicates the inside of the base cylinder oil chamber 101 and the inside of the cylinder outer oil chamber 103 is provided at the lower portion of the cylindrical portion 22a. The base cylinder oil chamber 101 and the cylinder outer oil chamber 103 are filled with hydraulic oil. The hydraulic oil moves between the base cylinder oil chamber 101 and the cylinder outer oil chamber 103 through the communication hole 104 as the piston 62 and the piston 31 move. The communication hole 104 is provided at a low position outside the respective movement ranges of the piston 31 and the piston 62. Thereby, even if the piston 62 and the piston 31 move, the base cylinder oil chamber 101 and the cylinder outer oil chamber 103 are not communicated with other spaces through the communication hole 104, and the base cylinder oil chamber 101 and the cylinder outer oil are not communicated. The state where the chamber 103 communicates with the communication hole 104 is maintained.

  The piston 31 adjacent to the lower side of the outer oil chamber 112 is provided with a piston discharge hole 38 for discharging the working oil from the upper outer oil chamber 112 to the lower side of the piston 31 at the lowermost portion of the outer oil chamber 112. . The piston discharge hole 38 is closed by a plug (blocking body) 39 that can be attached to and detached from the piston 31. In this example, a piston discharge hole 38 is provided on the center line of the injection hole 36 provided in the upper part of the base cylinder body 22 (that is, directly below).

  Each of the outer peripheral surface of the stopper 39 and the inner peripheral surface of the piston discharge hole 38 is provided with a threaded portion. The stopper 39 is attached to the piston 31 in a state in which the piston discharge hole 38 is closed by being screwed into the piston discharge hole 38.

  The plug 39 can be attached to and detached from the piston 31 by a rod-like attachment / detachment tool (not shown) inserted into the outer oil chamber 112 from the injection hole 36. In this example, a hook is provided at the tip of the detachable tool, and a hook hole for hooking the hook of the detachable tool is provided on the top of the plug 39. The stopper 39 is attached to and detached from the piston 31 by being turned by the attaching / detaching tool while the collar portion of the attaching / detaching tool inserted into the outer oil chamber 112 is hooked on the hooking hole of the stopper 39.

  The piston 41 adjacent to the lower side of the outer oil chamber 122 is provided with a piston discharge hole 48 for discharging hydraulic oil from the upper outer oil chamber 122 to the lower side of the piston 41 at the lowermost portion of the outer oil chamber 122. . The piston discharge hole 48 is closed by a plug (blocking body) 49 that can be attached to and detached from the piston 41. In this example, a piston discharge hole 48 is provided on the center line of the injection hole 46 provided in the upper portion of the plunger main body 32 of the first plunger 30 (that is, directly below).

  Each of the outer peripheral surface of the stopper 49 and the inner peripheral surface of the piston discharge hole 48 is provided with a threaded portion. The stopper 49 is attached to the piston 41 with the piston discharge hole 48 closed by being screwed into the piston discharge hole 48.

  The plug 49 can be attached to and detached from the piston 41 by the rod-like attachment / detachment tool inserted into the outer oil chamber 122 from the injection hole 46. The configuration of the plug 49 is the same as the configuration of the plug 39. The stopper 49 is attached to and detached from the piston 41 by being turned by the attaching / detaching tool in a state where the collar portion of the attaching / detaching tool inserted into the outer oil chamber 122 is hooked on the hooking hole of the stopper 49.

  An outer discharge hole 205 that connects the base cylinder outer oil chamber 103 and the outside is provided at the lowermost portion of the outer cylindrical portion 22 b of the base cylinder 20. That is, of the space in the base cylinder body 22 of the base cylinder 20, the space (in this example, the base cylinder oil chamber 101) communicated with the outer oil chambers 112 and 122 by opening the piston discharge holes 38 and 48. The communication hole 104, the cylinder outer oil chamber 103, and the external discharge hole 205 communicate with the outside. A lid 206 for preventing the hydraulic oil from flowing out is detachably provided at the discharge port of the external discharge hole 205. Other configurations are the same as those of the second embodiment. The configuration of the counterweight buffer 11 is the same as the configuration of the car buffer 10.

  When the hydraulic oil in the car shock absorber 10 is discharged, the outer oil chambers 112, 122 and 122 are removed by removing the stoppers 39 and 49 and the lid 206 and opening the piston discharge holes 38 and 48 and the external discharge hole 205, respectively. The hydraulic oil in the cylinder outer oil chamber 103 is naturally discharged to the outside through the external discharge hole 205. The hydraulic oil in the counterweight buffer 11 is also discharged in the same manner as when the hydraulic oil in the car buffer 10 is discharged.

  In such a car shock absorber 10, piston discharge holes 38 and 48 for discharging the working oil from the upper outer oil chambers 112 and 122 to the lower side of the pistons 31 and 41 are provided in the pistons 31 and 41. Since the plugs 39 and 49 for closing the valves 38 and 48 can be detached from the pistons 31 and 41 by means of a detachable tool inserted into the outer oil chambers 112 and 122 from the injection holes 36 and 46, similarly to the third embodiment. By moving the car 3 downward from the lowermost floor so that the entire car shock absorber 10 is in a contracted state, all the hydraulic oil is removed by gravity only by removing the stoppers 39 and 49 and the lid 206. It can be discharged naturally. Thereby, the exchange operation | work of the hydraulic fluid with respect to the cage | basket | car buffer 10 can be made still easier. The same effect as the car shock absorber 10 can be obtained for the counterweight shock absorber 11 as well.

Embodiment 7 FIG.
In the sixth embodiment, the pressure chamber 61 is provided in the base cylinder 20, but the pressure chamber 61 may be provided in an accumulator separated from the base cylinder 20.

  21 is a sectional view showing an elevator car shock absorber according to Embodiment 7 of the present invention. The base cylinder 20 is not provided with the outer wall portion 28. Further, an accumulator 70 separated from the base cylinder 20 is connected to the base cylinder body 22 via a connection pipe (communication pipe) 63. As the connection pipe 63, for example, a pipe or a tube is used.

  In the space in the accumulator 70, a plate-like piston 62 is provided so as to be slidable in the vertical direction. Thereby, the space in the accumulator 70 is divided into upper and lower portions by the piston 62. In the accumulator 70, the space above the piston 62 is a pressure chamber (biasing body) 61, and the space below the piston 62 is a cylinder outer oil chamber 103. The pressure chamber 61 is filled with high-pressure gas (compressed gas). The high pressure gas is filled into the pressure chamber 61 from a gas introduction portion (not shown) provided in the accumulator 70.

  The base cylinder oil chamber 101 and the cylinder outer oil chamber 103 are communicated with each other through a connecting pipe 63. The base cylinder oil chamber 101 and the cylinder outer oil chamber 103 are filled with hydraulic oil. The hydraulic oil moves between the base cylinder oil chamber 101 and the cylinder outer oil chamber 103 through the connection pipe 63 as the piston 62 and the piston 31 move. The connection position of the connection pipe 63 with respect to each of the base cylinder main body 22 and the accumulator 70 is a low position outside the respective movement ranges of the piston 31 and the piston 62. Thereby, even if the piston 62 and the piston 31 move, the base cylinder oil chamber 101 and the cylinder outer oil chamber 103 are not communicated with other spaces through the connection pipe 63, and the base cylinder oil chamber 101 and the cylinder outer oil are not communicated. The state where the chamber 103 communicates with the connecting pipe 63 is maintained.

  An outer discharge hole 205 that communicates the base cylinder oil chamber 101 with the outside is provided at the lowermost portion of the cylindrical portion 22a of the base cylinder 20. That is, of the space in the base cylinder body 22 of the base cylinder 20, the space (in this example, the base cylinder oil chamber 101) communicated with the outer oil chambers 112 and 122 by opening the piston discharge holes 38 and 48. The external discharge hole 205 communicates with the outside. A lid 206 for preventing the hydraulic oil from flowing out is detachably provided at the discharge port of the external discharge hole 205. Other configurations are the same as those of the seventh embodiment. The configuration of the counterweight buffer 11 is the same as the configuration of the car buffer 10.

  Thus, even if the pressure chamber 61 is provided in the accumulator 70 separated from the base cylinder 20, the same effect as in the sixth embodiment can be obtained.

  The external discharge hole 205 communicates with the outer oil chambers 112 and 122 by opening the piston discharge holes 38 and 48 in the base cylinder oil chamber 101 (that is, the space in the base cylinder body 22 of the base cylinder 20). For example, it may be provided in the middle of the connecting pipe 63 or in the lowermost part of the accumulator 70.

  In each of the above-described embodiments, the plunger main body 52 of the third plunger 50 penetrates the upper portion of the plunger main body 42 of the second plunger 40 via a gap, and the plunger main body 40 of the second plunger 40 Is not provided between the plunger main body 52 of the third plunger 50 and the upper portion of the plunger main body 42 of the second plunger 40. A communication hole that forms an outer oil chamber above the piston 51 in the second plunger 40 and communicates the outer oil chamber formed above the piston 51 and the inner oil chamber 121 existing below the piston 51. May be provided on the piston 51. In this case, when the car shock absorber 10 contracts, most of the hydraulic oil in the inner oil chamber 121 moves to the outer oil chamber 122 through the communication hole 45, and only a part of the hydraulic oil in the inner oil chamber 121 moves above the piston 51. Move to the outer oil chamber. Thus, even if the configuration that forms the flow of the auxiliary hydraulic oil is applied to the car shock absorber 10 and the counterweight shock absorber 11, the same effect as in the first embodiment can be obtained.

  Moreover, in each said embodiment, although the hydraulic fluid inject | poured in the cage buffer 10 and the counterweight buffer 11 is oil, it is not limited to this, If it is a liquid which transmits a pressure Good. Therefore, for example, water or the like may be used as the hydraulic fluid.

  3 car (elevating body), 4 counterweight (elevating body), 10 car shock absorber, 11 counterweight shock absorber, 20 base cylinder, 22 base cylinder body (hollow part), 30 first plunger, 31 piston, 32 Plunger body (hollow part), 35, 45 communication hole, 36, 46 injection hole, 38, 48 piston discharge hole, 38a, 48a first through hole, 38b, 48b second through hole, 39, 49 plug ( Occlusion body), 40 second plunger, 41 piston, 42 plunger main body (hollow part), 50 third plunger, 51 piston, 52 plunger main body, 71 holder, 111, 121 inner oil chamber (inner chamber), 112 , 122 Outside oil chamber (outer chamber), 311, 411 Piston body disk, 312, 412 Opening / closing disk.

Claims (9)

A base cylinder having a hollow portion erected vertically to the pit portion of the hoistway,
A plurality of plungers sequentially connected so as to slide upward from the base cylinder, and an urging body for urging the lowermost plunger toward the base cylinder upward;
Each of the plungers has a plate-like piston and a plunger body extending upward from the piston,
Among the upper and lower plungers connected to each other, the plunger body of the lower plunger is a hollow portion,
The piston of each of the plungers is arranged so as to slid into the hollow part while vertically separating the space in the hollow part adjacent to the lower part,
The plunger body of each plunger penetrates the upper part of the hollow portion adjacent to the lower side,
Between the hollow portion of the plunger and the hollow portion adjacent to the lower side, an outer chamber whose volume is increased according to the downward displacement of the plunger is provided,
In the hollow portion of the plunger, an inner chamber whose volume is reduced in accordance with the downward displacement of the plunger adjacent to the upper side is provided,
When each of the plungers is slid with respect to the hollow portion adjacent to the lower side while the hydraulic fluid moves between the outer chamber and the inner chamber through a communication hole provided in the hollow portion of the plunger, The whole is expanded and contracted,
In the upper part of the hollow part, an injection hole for injecting the working fluid into the outer chamber is provided,
The piston is provided with a piston discharge hole for discharging the working fluid from the outer chamber to a space adjacent to the lower side,
The piston discharge hole is designed to be opened and closed,
Of the space in the hollow portion of the base cylinder, the space communicated with the outer chamber by opening the piston discharge hole is for an elevator that is communicated to the outside through an external discharge hole for discharging the hydraulic fluid to the outside. Shock absorber. Each of the hollow portion of the plunger and the hollow portion of the base cylinder is a cylindrical portion that is rotatable around a common central axis,
The elevator shock absorber according to claim 1, wherein distances between the injection hole and the piston discharge hole with respect to the common outer chamber and the central axis are equal to each other.   The elevator shock absorber according to claim 1, wherein the piston discharge hole is provided immediately below the injection hole. Each of the hollow portion of the plunger and the hollow portion of the base cylinder is a cylindrical portion that is rotatable around a common central axis,
The piston has a piston main body disk, and an open / close disk that overlaps the piston main body disk and is rotatable about the central axis with respect to the piston main body disk.
The piston discharge hole is composed of a first through hole provided in the piston main body disk and a second through hole provided in the opening / closing disk,
The elevator shock absorber according to claim 1, wherein the distance between each of the first through hole and the second through hole and the central axis is equal to each other. It is the installation method of the buffer for elevators which installs the buffer for elevators as described in any one of Claims 1-4,
The plungers are slid in a direction approaching the base cylinder against the urging force of the urging body to bring the entire elevator shock absorber into a contracted state, and the contracted state of the elevator buffer is held by a holder. Shrinkage process during installation,
An arrangement step of arranging the elevator shock absorber at the installation location;
After the contraction step and the placement step, a hydraulic fluid injection step for injecting the hydraulic fluid into the outer chamber from the injection hole, and after the hydraulic fluid injection step, the holder is removed from the elevator shock absorber. A method for installing an elevator shock absorber, comprising: an installation release step for releasing the above-mentioned contracted state of the shock absorber. Among the elevator buffers according to any one of claims 1 to 4, an elevator buffer installation method for installing an elevator buffer in which the biasing body is a compressed gas,
A contraction step at the time of installation in which each of the plungers is slid in a direction approaching the base cylinder to bring the entire elevator buffer into a contracted state, and the contracted state of the elevator buffer is maintained;
An arrangement step of arranging the elevator shock absorber at the installation location;
After the contraction step and the arrangement step, a hydraulic fluid injection step for injecting hydraulic fluid into the outer chamber from the injection hole, and after the hydraulic fluid injection step, the compressed gas is introduced into the elevator buffer and the elevator The installation method of the elevator shock absorber provided with the cancellation | release process at the time of the installation which cancels | releases the said contraction state of the shock absorber for vehicles. It is the maintenance method of the elevator buffer which adds a hydraulic fluid to the elevator buffer as described in any one of Claims 1-4,
A maintenance contraction step in which the elevator body is lowered while pushing the uppermost plunger with the lift body so that the entire elevator shock absorber is in a contracted state, and after the maintenance contraction step, the outer chamber extends from the injection hole. Maintenance of an elevator buffer having a maintenance-time release step of raising the lifting body to release the contracted state of the elevator buffer after the hydraulic fluid injection step Method. It is the maintenance method of the elevator buffer which discharges | emits the hydraulic fluid of the elevator buffer as described in any one of Claims 1-4,
A maintenance contraction process in which the elevator body is lowered while pushing the plunger at the uppermost stage with the elevator body to bring the entire elevator shock absorber into a contracted state, and after the maintenance contraction process, the external discharge hole and the piston A maintenance method for an elevator shock absorber having a hydraulic fluid discharge step that opens the discharge hole and discharges the hydraulic fluid. The elevator provided with the raising / lowering body which can raise / lower a hoistway, and the buffer for elevators as described in any one of Claims 1-4 provided below the said hoisting body in the lower end part of the said hoistway.

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